A BOAT person forced home on last week's repatriation flight from Hong Kong has been jailed for his part in the death of a man before he left Vietnam. Nguyen Cong Khuong was taken from his wife and sons shortly after arriving in Hanoi to serve a five-year jail sentence handed down in a trial held in his absence. He is the seventh returnee jailed after recent flights. Vietnamese Interior Ministry officials warned hundreds more faced prison as a 'hard core' of Vietnamese criminals returns. The case has sparked renewed demands from Britain and Hong Kong to be told of possible jailings in advance. The British Embassy has yet to comment officially. Sources said diplomats had learned of recent jailings only after the arrests had been made - despite 'firm understandings' that they must be told beforehand. British concerns are to be raised in meetings with Vietnamese Foreign Ministry officials this week. United Nations refugee monitors are also investigating while waiting for full explanations of other jailings. Khuong fled his fishing village in Quang Ninh in the far north of Vietnam late in 1989 shortly after the death of a man caught stealing from his father's house. Khuong and his brothers beat the man severely before handing him to the police. The robber died in police custody within days but Khuong, now in his mid-30s, fled to Hong Kong with his wife and two sons shortly afterwards. The alleged severity of the beating administered as punishment by Khuong and his brothers led Vietnamese police to seek a trial in absentia for manslaughter. A warrant for his arrest was issued and Khuong was held shortly after arriving at the Dong Ngac reception centre late last week. Vietnam has an acknowledged right to take action against returning boat people for crimes committed before their departure but has signed agreements that it will not seek prosecutions for illegal departure. Both the British and United Nations High Commissioner for Refugees will seek full explanations on Khuong's detention on forthcoming visits to Quang Ninh. They may also demand prison visits to check the validity of the case against Khuong face to face, but no decisions have yet been made.